Challenger 750 - junk hisun motors!

[Joe Breaux]

While I am the first one to blast HISUN and everyone involved with them  for poor quality and nonexistent warranty ....since I "hybridized" my Massimo with a bunch of  Yamaha parts, its managed to be a decent machine .. Altho I did pull out several handfuls of my remaining hair in the beginning

[cliffno350]

Yeah with the Yamaha timing components, cam and valves the motor was better and maybe that cratered the trans? So a Yamaha motor will probably gut the axles...

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[Douglas C]

Yes there are definitely junk engines! I have a 2018 with 3100 miles on it and it's crap it will not idle and overheats extremely fast cannot even take it out of the yard...

 

 

[Joe Breaux]

We found that bypassing the thermal switch on radiator to make fan run continuously when key is on, ended the overheating.....of course  thats after we replaced the head gasket, then the warped burnt  head and  gasket again.. in beginning on hot day, it would overheat in 1-2 miles.... We tested their settings for switch. The fan engaged at 238 degrees if I remember correctly .. and the switch is on the COLD  side!!!  how hot was the engine ??? 250* -260*??  The heat in the cab was unbearable, I would be drenched in sweat in minutes.   .. now with a new adjustable switch and engine staying 150*-160* , the cab is pleasant..  I would also Check yours to see if head gasket is fried. look for air bubbles in recovery bottle while idling hot.  and / or water in oil. 

[Vanny]

Can a 2022 Hison 750 sector motor be replaced with any rhino 660 motor or does it need to be a specific year range?

[that guy from Canada]

Just an fyi

Ive worked on a few hisuns biggest issue with 700 750 is that when the engine was installed it was installed at the wrong angle and when going uphill it runs low on oil. Add 1 liter or quart of oil from full and re mark the dip stick.

This will solve a lot of issues especially with timing chain and wet clutch.

[Joe Breaux]

wouldnt running that much  oil OVERFULL in a small engine like this  cause oil  leaks and oil burning ? That level  increases pressure in crankcase, and excessive oil  being slung by crank into cylinder walls and reduced power because of the drag on crank ....just sayin

[that guy from Canada]

What your saying is true in some cases like very small 4 stroke, however the hisun has a built in windage tray for the crank, no spash.

Also due to the icreased volume of the case, it has a transmission built in, excess crank pressure isnt really an issue.

Either way avoiding catastrophic engine failure due to lack of oil is the key here.

Also i was incorrect it starves when going steep downhill not up.

[Joe Breaux]

not an issue here..  we have no hills in the swamp!!  😄

[Kevin Germain]

Looking for some advice on my 2016 750 Challenger I believe the timing chain has jumped or came off, can we put a Yamaha head on it?